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How to do math operation for BigInteger?

package com.javacoderanch.example.math;

import java.math.BigInteger;

public class BigIntegerOperation {
    public static void main(String[] args) {
        BigInteger numberA = new BigInteger("98765432123456789");
        BigInteger numberB = BigInteger.TEN;

        numberA = numberA.add(numberB);
        System.out.println("numberA = " + numberA);

        numberA = numberA.multiply(numberB);
        System.out.println("numberA = " + numberA);

        numberA = numberA.subtract(numberB);
        System.out.println("numberA = " + numberA);

        numberA = numberA.divide(numberB);
        System.out.println("numberA = " + numberA);

        numberA = numberA.mod(numberB);
        System.out.println("numberA = " + numberA);

        numberA = numberA.pow(2);
        System.out.println("numberA = " + numberA);

        numberA = numberA.negate();
        System.out.println("numberA = " + numberA);
    }
}

Our class result are:

numberA = 98765432123456799
numberA = 987654321234567990
numberA = 987654321234567980
numberA = 98765432123456798
numberA = 8
numberA = 64
numberA = -64